174 1996 David Lindström david@tdb.uu.se Effects of Numerical Dissipation on the Speed of Combustion Waves Numerical methods for solving hyperbolic conservations laws usually involves addition of extra dissipation. When the conservations laws are coupled to a source term representing chemical reactions, this extra dissipation causes the reaction fronts to move with an incorrect speed of propagation. It is studied how the propagation speed depends on the order of approximation of the numerical method. Remedies are presented which reduce the error in the speed.